str = "Hello, my friends, welcome to Python."
str.upper()
'HELLO, MY FRIENDS, WELCOME TO PYTHON.'
str.index('my')
7
str[0:5]
'Hello'
 str + " I hope you enjoy your stay."
'Hello, my friends, welcome to Python. I hope you
enjoy your stay'
print str(5) + " + " + str(3) + " = " + str(3+5)
5 + 3 = 8
str.count('e')
4
len(str)
37
